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/* modhex.c --- Simple ModHex conversion command line tool.
*
* Written by Simon Josefsson <simon@josefsson.org>.
* Copyright (c) 2006-2012 Yubico AB
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include "yubikey.h"
#include <stdio.h>
#include <stdlib.h>
int
main (int argc, char *argv[])
{
int argi;
int decode_p = 0;
int hex_p = 0;
char *data;
size_t inlen;
/* Usage. */
if (argc < 2)
{
printf ("Usage: %s [-dh] <data>\n", argv[0]);
printf ("\n");
printf
("Convert input DATA as specified and print output to STDOUT.\n");
printf ("\n");
printf (" -d: Decode data (the default is to encode data).\n");
printf (" -h: Use hex encoding for all non-modhex data.\n");
printf (" DATA: string with data to encode\n");
printf ("\n");
printf ("Examples:\n");
printf ("\n");
printf (" ModHex encode ASCII-string \"test\":\n");
printf (" %s test\n", argv[0]);
printf ("\n");
printf (" Decode ModHex data \"ifhgieif\" into ASCII string:\n");
printf (" %s -d ifhgieif\n", argv[0]);
printf ("\n");
printf (" ModHex encode hex-encoded data \"b565716f\":\n");
printf (" %s -h b565716f\n", argv[0]);
printf ("\n");
printf
(" Decode ModHex data \"nghgibhv\" and print hex-encode data:\n");
printf (" %s -d -h nghgibhv\n", argv[0]);
return 1;
}
/* Command line handling. */
argi = 1;
while (argc > argi && (!decode_p || !hex_p))
{
if (strcmp (argv[argi], "-d") == 0)
{
decode_p = 1;
argi++;
}
else if (strcmp (argv[argi], "-h") == 0)
{
hex_p = 1;
argi++;
}
else
break;
}
if (argc < argi + 1)
{
printf ("error: missing argument\n");
return 1;
}
data = argv[argi];
inlen = strlen (data);
if (!decode_p && hex_p)
{
unsigned long i;
char *tmp;
if (inlen & 1)
{
printf ("error: size of hex encoded input not even\n");
return 1;
}
tmp = malloc (inlen / 2 + 1);
if (!tmp)
{
perror ("malloc");
return 1;
}
for (i = 0; i < inlen; i++)
{
const char *hex = "0123456789abcdef";
char *p;
if ((p = strchr (hex, data[i])) == NULL)
{
printf ("error: input not hex encoded at position %lu\n", i);
free (tmp);
return 1;
}
if (i & 1)
tmp[i / 2] |= p - hex;
else
tmp[i / 2] = (p - hex) << 4;
}
tmp[i / 2] = '\0';
inlen = inlen / 2;
data = tmp;
}
/* Doit. */
{
size_t i;
char *buf = malloc (2 * inlen + 1);
if (!buf)
{
perror ("malloc");
return 1;
}
if (decode_p)
yubikey_modhex_decode (buf, data, inlen / 2);
else
yubikey_modhex_encode (buf, data, inlen);
if (decode_p && hex_p)
{
for (i = 0; i < inlen / 2; i++)
printf ("%02x", buf[i] & 0xFF);
printf ("\n");
}
else if (decode_p)
fwrite (buf, inlen / 2, 1, stdout);
else
printf ("%s\n", buf);
free (buf);
}
if (!decode_p && hex_p)
free (data);
return 0;
}
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